You can give different objects in the scene the same name, but two sibling nodes (nodes with the same parent) cannot have the same name.
In node and attribute names, all punctuation except for the underscore (_) and the pound sign (#) are illegal characters.
To change the name of an object or node
To rename multiple objects at once
To add a prefix to the names of a parent node and all its children
To search and replace names in the scene
You can search and replace all node names in the scene, selected node names, or node names in a hierarchy.